Coupling effects in the time domain for an interconnecting bus in high-speed GaAs logic circuits

In the present paper, we evaluate the behavior of an eight-line bus in GaAs technology for high-velocity logic signals with a 10-ps rise (or fall) time. We highlight the great importance of coupling effects in the time domain on the distortion of the signals. Two possible solutions are studied to reduce these phenomena and to improve the transmission of the signals on lines. These solutions are to earth some lines between active lines or to add a second ground plane over the lines.